Antero Reservoir
Park County, Colorado3,446 acresView mapDirections
Colorado WQCD publishes the water-quality measurements for Antero Reservoir. Here is what has been measured.
- Oligotrophic
- 112 ft max depth
- Limited data
Antero Reservoir in Park County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Water clarity: 14.8 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.1 µg/L. Surface area: 3446 acres.
Antero Reservoir is a 3,446-acre cold, clear oligotrophic lake in Park County, Colorado with an estimated average depth of about 112 feet. Compared to the 1 other monitored lakes in Park County, Antero Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2021-09-23. Methodology: how these readings are compared.
Antero Reservoir covers about 3,400 acres in Park County. Vrbo is where to look for cabins and lake homes around Antero Reservoir, and Booking.com and Expedia search hotels near the lake for your dates.
What Antero Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water14.8 ft of visibility
- Big water3,446 acres
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Antero Reservoir is safe to swim in today is a call for the Water Quality Control Division of the Colorado Department of Public Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Antero Reservoir
These are the measurements Colorado WQCD publishes for Antero Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.8 ft. Phosphorus 15 µg/L. Chlorophyll-a 1.1 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 15µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.1µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Antero Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~112 ft est.
Surface area
3,446 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Colorado has not published bathymetry for Antero Reservoir.
Lake Size & Watershed
Watershed (drainage) area
168 sq mi
HydroLAKES / HydroSHEDS
Shoreline
11.6 mi
HydroLAKES / HydroSHEDS
Elevation
8,947 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Antero Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Antero Reservoir in Park County, Colorado — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Antero Reservoir
Prices for Oct 23–25, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Colorado’s top lakes →
Follow Antero Reservoir’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Antero Reservoir
Reservoir Info (USACE NID)
Antero Reservoir is a man-made reservoir impounded by the Antero (completed 1909), built primarily for water supply on the S. Fork S. Platte River; earth-type dam, 48 ft tall and 4,190 ft long.
- Surface area
- 3,446 ac
- Normal storage
- 44,733 ac-ft
- Max storage
- 92,651 ac-ft
- Drainage area
- 200 sq mi
- Hazard class
- High
- Owner
- DENVER BOARD OF WATER COMMISSIONERS
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID CO00351 · Operator website
Nearby Lakes in Park County
Frequently asked questions about Antero Reservoir
Where is Antero Reservoir?
- Antero Reservoir is a lake in Park County, Colorado. Its water-quality measurements are published by Colorado WQCD and shown on this page as reported.
What is the water quality of Antero Reservoir?
- Antero Reservoir in Park County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Water clarity: 14.8 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.1 µg/L. Surface area: 3446 acres.
Is Antero Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Antero Reservoir?
- No published bathymetric survey covers Antero Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 112 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 3446 acres.
Explore Antero Reservoir across LakeQuality
4 thermal springs within 22.4 mi, nearest Hartsel Hot Springs
Species activity outlook by water temperature and season
Where to stay at Colorado's top lakes, each with its readings
Colorado's cleanest lakes, ranked on agency measurements
More lakes in Colorado
Other Lakes in Colorado
Oligotrophic Lakes in Colorado
Where this data comes from
16 measurements from 2 monitoring stations, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX16 samples · 2021
Analytical methods
- Secchi disk depth measurement
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Nitrogen in Water by Pyrolysis Detection
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)